| First astronomical detection of the cumulene carbon chain molecule H2C6 in TMC-1. | |
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MedLine Citation:
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PMID: 11541460 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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The cumulene carbenes are important components of hydrocarbon chemistry in low-mass star-forming cores. Here we report the first astronomical detection of the long-chain cumulene carbene H2C6 in the interstellar cloud TMC-1, from observations of two of its rotational transitions: J(K,K') = 7(1,7) --> 6(1,6) at 18.8 GHz and 8(1,8) --> 7(1,7) at 21.5 GHz, using NASA's Deep Space Network 70 m antenna at Goldstone, California. In addition we also observed the shorter cumulene carbene H2C4 at the same position. The fractional abundance of H2C6 relative to H2 is about 4.7 x 10(-11) and that of H2C4 is about 4.1 x 10(-9). The abundance of H2C6 is in fairly good agreement with gas-phase chemical models for young molecular cloud cores, but the abundance of H2C4 is significantly larger than predicted. |
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Authors:
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W D Langer; T Velusamy; T B Kuiper; R Peng; M C McCarthy; M J Travers; A Kovacs; C A Gottlieb; P Thaddeus |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Astrophysical journal Volume: 480 ISSN: 0004-637X ISO Abbreviation: Astrophys. J. Publication Date: 1997 May |
Date Detail:
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Created Date: 1999-03-16 Completed Date: 1999-03-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9890633 Medline TA: Astrophys J Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: L63-6 Citation Subset: S |
Affiliation:
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Jet Propulsion Laboratory, Californiia Institute of Technology, Pasadena 91109, USA. langer@langer.jpl.nasa.gov |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Astronomy
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instrumentation* Carbon / chemistry Extraterrestrial Environment* Gases / analysis* Hydrocarbons / analysis, chemistry* Methane / analogs & derivatives*, analysis, chemistry Models, Chemical* Spectrum Analysis |
| Chemical | |
Reg. No./Substance:
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0/Gases; 0/Hydrocarbons; 2465-56-7/carbene; 74-82-8/Methane; 7440-44-0/Carbon |
| Investigator | |
Investigator/Affiliation:
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S M Levin / JPL |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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